feat!: add chromosome lookup to sequence reference utils #116

Job	Run time
test (3.12)	23s
python-lint	23s
rust-lint	8s
test (3.11)	32s
test (3.13)	30s
precommit_hooks (trailing-whitespace)	13s
precommit_hooks (end-of-file-fixer)	9s
precommit_hooks (mixed-line-ending)	12s
	2m 30s

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